Question:
The direction ratios of two lines are $a, b, c$ and $(b-c),(c-a),(a-b)$ respectively. The angle between these lines is
A. $\frac{\pi}{3}$
B. $\frac{\pi}{2}$
C. $\frac{\pi}{4}$
D. $\frac{3 \pi}{4}$
Solution:
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